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In this NASA handout image obtained December 15, 2014, the glaciers and landscape in northeast Greenland as it looked on April 19, 2013. A warming planet may lead to swifter ice loss on Greenland's ice sheet, and faster sea level rise for the rest of the world than previously predicted, scientists said Monday. Two separate international studies raised concern about the pace of ice melt on the world's second largest ice sheet after Antarctica, and suggested that scientists may have underestimated the variable behavior of Greenland's ice. AFP PHOTO / HANDOUT / NASA / MICHAEL STUDINGER == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO / HANDOUT / NASA / MICHAEL STUDINGER "/ NO MARKETING / NO ADVERTISING CAMPAIGNS / NO A LA CARTE SALES / DISTRIBUTED AS A SERVICE TO CLIENTS == MICHAEL STUDINGER/AFP/Getty Images